The claim is a near-verbatim paraphrase of official Electoral Commission guidance. The Electoral Commission's guidance pages for local elections, mayoral elections, and UK parliamentary general elections all state: "A local non-party campaigner cannot spend more than this permitted sum without the agent's written authorisation to incur the additional spending, which will count towards the candidate's spending limit." The relevant rule derives from section 75 of the Representation of the People Act 1983. The only minor discrepancy is that the claim says "the candidate's written authorisation," whereas the Electoral Commission guidance for most election types specifies the agent's written authorisation (i.e., the candidate's election agent). However, for some election types (e.g., Senedd elections from May 2026), the guidance says authorisation can come from "a candidate or agent." In practice, the agent acts on behalf of the candidate, and the core legal principle — that a local non-party campaigner is limited to a permitted sum and cannot exceed it without written authorisation that brings the additional spending under the candidate's spending limit — is accurately stated. The claim correctly captures the substance of the rule: there is a permitted spending sum for local non-party campaigners, and exceeding it requires written authorisation (from the candidate or their agent), with the excess counting toward the candidate's spending limit. Sources: Electoral Commission, "Local campaigning" (local authority and mayoral elections in England) — https://www.electoralcommission.org.uk/guidance-candidates-and-agents-local-authority-mayoral-elections-england/candidate-spending/local-campaigning; Electoral Commission, "Local campaigning" (UK parliamentary general elections) — https://www.electoralcommission.org.uk/guidance-candidates-and-agents-uk-parliamentary-general-elections-great-britain/candidate-spending/local-campaigning; Electoral Commission, "Non-party campaigners: Local campaigning at Senedd elections (elections from 7 May 2026 onwards)" — https://www.electoralcommission.org.uk/full-guidance/non-party-campaigners-local-campaigning-senedd-elections-elections-7-may-2026-onwards